(B) The effective magnetic moment is calculated using the formula $\mu = \sqrt{n(n + 2)} \text{ B.M.}$,where $n$ is the number of unpaired electrons.F

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(B) The effective magnetic moment is calculated using the formula $\mu = \sqrt{n(n + 2)} \text{ B.M.}$,where $n$ is the number of unpaired electrons.For $Sc^{3+}$,the electronic configuration is $[Ar] 3d^0$.Since there are no unpaired electrons,$n = 0$.Therefore,$\mu = \sqrt{0(0 + 2)} = 0 \text{ B.M.}$